Problem: Two compounds, HA & HB have the same K a value. If a solution is prepared containing 0.5  mole of HA and 0.5 of NaB which of the following is True? A) The solution pH = pKa but it has no Buffer Capacity B) The solution is not a Buffer because there is no conjugate base of A or conjugate acid of B-. C) This solution is a good Buffer because the [weak base] = [weak acid] D) The pH = pKb for the B- E)  It is not possible to determine if this is a good buffer or not.

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Problem Details

Two compounds, HA & HB have the same K a value. If a solution is prepared containing 0.5  mole of HA and 0.5 of NaB which of the following is True?

A) The solution pH = pKa but it has no Buffer Capacity

B) The solution is not a Buffer because there is no conjugate base of A or conjugate acid of B-.

C) This solution is a good Buffer because the [weak base] = [weak acid]

D) The pH = pKb for the B-

E)  It is not possible to determine if this is a good buffer or not.

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